A Short History of Flash Memory (1)

Flash Memory Summit, August 2016 – Flash memory is the enabling technology for most of the mobile devices today. It allows for very high capacities of storage for things like music, voice, photos and videos to be stored for long periods of time, without needing power to store the information when it is not being used.

Eli Harari, who holds over 100 patents and has widespread recognition (including IEEE Reynold B. Johnson Data Storage device Technology Award in 2006 and IEEE Robert N. Noyce Medal in 2009), described flash memory as descriptive technology in that time. This descriptive technology enabled consumer applications such as cellphones, digital cameras, music players etc. that we enjoy today and they shape our lives. Here is a timeline of history of flash memory development.

The beginning of successful story of flash memory started at Bell Laboratories. In 1967 Kahng and Sze invented the floating gate memory device which allows a transistor to remember a digital value of 0 or 1, without power, until it is ready to be checked. Few years later Eli Harari of Hughes Electronics filed for first practical floating gate EEPROM (Electrically Erasable Programmable Read Only Memory) using thin SiO2 and using the electron characteristic of Fowler Nordheim tunneling for program and erase.

In 1978 Hughes Electronics introduced first CMOS NOVRAM 256-bit chip (non-volatile SRAM) and two years later the 1980, first CMOS EEPROM 8Kbit chip was released. Both of these chips used Fowler Nordheim floating gate EEPROM technology. In 1980 Intel introduced the Intel2816, a 16K bit HMOS EEPROM with Fowler Nordheim tunneling and 3 years later the Intel2817A 16K bit EEPROM. While these chips were in the marketplace, the first paper describing flash EEPROM was presented by Fujio Masuoka of Toshiba at IEEE International Electron Devices Meeting (IEDM) in San Francisco in 1984, the year after Exel filed patent for the first NOR organized flash memory cell. In 1986 Intel introduced the flash card concept with ECC and on-card controller and the company formed unit focusing on solid state drives.

The flash memory industry financial success started grown rapidly at the end of the 1980s ($1.6M in 1987; $6.4M in 1988; $25M in 1989) followed by many inventions and patents.

1988 – Early EEPROM inventor/investigator Elli Harari along with Sanjay Mehrotra and Jack Yuan founded SunDisk (later the name was changed to SanDisk) in 1988 to develop new “system Flash” architecture combining embedded controller, firmware and flash memory to emulate disk storage. The company filed the first two MLC (Multi-level-cell) flash patents. JPEG and MPEG standards allowed economical production of digital cameras and first flash-based digital camera, Fuji DS-1P was demonstrated. Intel sampled 1Mb NOR flash. Intel and Psion designed flash-based mobile PC.

1989 – SunDisk filed System Flash patent. M-Systems was founded and shorty after introduced the Flash Disk concept, that was precursor to flash SSDs. The same year Intel shipped 512K and 1Mb NOR flash. Psion introduced flash-based PC. Microsoft joined effort with Intel and introduced its Flash File System. Western Digital and SunDisk launched a NOR-based Flash SSD fully emulating a traditional rotating ATA HDD.

At Comdex (Computer Dealers’ Exhibition), the largest computer trade show in the world (precursor of today’s CES) that was held in Las Vegas, DiGiPro introduced 8Mb NOR Flashdisk. The flash industry reached 100 million parts shipped and made many introductions such as EReader by Sony, camera prototypes by Kodak, 1MB and 4MB linear flash PCMCIA card and 2Mb NOR chip by Intel, first NOR flash SSD: 20MB 2.5”, fully compatible with Conner Peripherals 2.5” ATA HDD. This year also PCMCIA set standard on ATA PC card form factor and pinout, using SunDisk “System Flash” specification for full HDD compatibility.

At the beginning of 1990 flash memory industry expanding amazingly fast like never before and the revenue grown from $170 million in 1991, $295 million in 1992, $505 million in 1993, $864 million in 1994 and reached over $1.8 billion in 1995.

1992 – Information Storage Devices introduced flash based voice recorder chip. AMD and Fujitsu released its first NOR product. M-Systems demonstrated TrueFFS that was adopted later by the PCMCIA as FTL. That was a year when Intel launched few products including: second generation FFS2, 8Mb flash chip, 4MB-20MB linear flash memory cards and 1Mb “boot bloc” NOR flash with sectors for BIOS applications – first use of internal write state machine to manage flash write algorithm. SunDisk introduced first serial 9Mb NOR Flash chip for SSD applications. Starting 1992 PCs began using flash for BIOS storage.